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SUBTRACTION Self-Correcting Quiz - NINES

1
11
-  9
2
11
-  9
3
17
-  9
4
14
-  9
5
18
-  9
6
18
-  9
7
12
-  9
8
14
-  9
9
13
-  9
10
10
-  9
11
15
-  9
12
12
-  9
13
16
-  9
14
10
-  9
15
16
-  9
16
13
-  9
17
17
-  9
18
15
-  9
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